davis



(No Model.)

B. B. DAVIS.

HAND ROCK'AND GOAL BORING MACHINE.

N0. 301,049. PatentedJune 24,1884.

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BENJAMIN B. DAVIS, OF IVILLIAMSTOIVN, PENNSYLVANIA, ASSIGNOR OF ONE-HALF TO THOMAS E. DAVIS, OF SAME PLACE.

HAND ROCK AND COAL BORING IVIACHBNE.

SPECIFICATION forming part of Letters Patent No. 301,049, dated June 24-, 1 884.

Application filed March 527, 1884. (No model.) M

To all whom it may concern.-

Be it known that I, BENJAMIN B. DAVIS, a citizen of the United States, residing at illiamstown, in the county of Dauphin and State 5 oflennsylvania, have invented certain new and useful Improvements in Hand Rock-Boring Machines; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters and figures of reference marked thereon, which form a part of this specification.

My invention relates to coal-n1ining machines; and it consists in the construction, combination, and arrangement of the several parts, as will be hereinafter more fully described and claimed.

In the drawings, Figure 1 is a side view of machine. Fig. 2 is a detail view of the bearing-jaws and the hinged boxes. Fig. 3 is a detail view of the box-sections. Figs. 4 and 5 are detail views of the drill-shafts.

The supporting-beam A has its inner end formed on one side with teeth or projections A, and has a clamping section or bar, B, hinged to it near said end, as shown. This section is also provided with projections B, similar to the projections A. This beam and bar are inserted while in the position shown in Fig. 1 into a hole in the bank of coal, and the set-screw B is turned through the beam against the bar and forces said parts into the position indicated in dotted lines, Fig. 1, and the supporting-beam will be firmly secured in position.

The jaws O G are provided in their upper ends with bearings O, and have their lower ends connected by plate This plate is provided with a depending stud or shaft which is j ournaled in the supporting-beam, as shown. It permits the bearing-jaws to be swung horizontally in order to adjust the drill to any desired position. A bracket, D, is mounted on the plate 0 near its forward edge, and serves as a bearing for the set-bolt D, which will be hereinafter described.

The box E is composed of the sections E 50 1], each of which is provided with a semicircular threaded bearing or recess, and with an upwardly-projecting armor bar, E. One of the bars is provided with a stud, E, which, when the box is closed, fits in a corresponding recess in the other bar, as will be understood from Figs. 2 and 3. The section E is provided with lugs F F, depending from its lower side. The rearlug, F, is the longer of the two, and is formed with a slot, F in its lower end. with a depending lug, F, which fits between lugs F F, and is pivoted thereto by pin F, as clearly shown. Vhere so desired, the lug F may be dispensed with; but I prefer to use it,

as a firmer bracing of the parts is thereby had. I provide each of these sections with a trunnion, G, which is journaled /in the bearings G, as clearly shown in Fig. 1. The bolt D is reduced in size at D near its rear end, forming a shoulder, D The contracted portion D is inserted through slot F, and the shoulder D bears against the forward side of lug F. A nut, D, is turned on the end of portion D up against the rear side of lug F. Now it will be seen that, by turning bolt D,the boxing can be tilted to any desired angle to the horizontal and secured. The adjusting-bolt, being arranged on the base of the bearingjaws, turns therewith, and is consequently'at all times in position for operation.

The feed-screw H turns through the boxing E. When it is desired to place this screw in position, the boxing is opened, as shown in Fig. 2, and the screws placed down therein. The bars E are then pressed together, as in- 8 5 dicated in dotted lines, Fig. 2, and the ring or collar is slipped down thereover, securing the sections of the boxing firmly together, as will be understood. At the forward end of the feed-screw I form a socket, H, into which 90 is fitted the tenons I on the drill-shaft I. These shafts may be made of different lengths and used as desired, replacing longer for shorter ones until the hole has been drilled the desired depth. A bar, .I, is secured on the 5 -rear end of the feed-screw, and at right angles thereto. This bar is provided with keepers or loops J. The crank-handle K has its bar K passedthrough these keepers, and is secured to the bar J by sctscrew K by loos- I00 The section E is also provided 60 g ening which the crank may be set longer or shorter, as desired.

The operation of my machine is simple,.

and will be readily understood from the description before given.

The drill-shaft I is provided at its forward end with a bit, J. Thisv bit is formed with the four corners j jj j", and is bifurcated by a slot, as shown. This bit, Ihave found, cuts easily and greatly reduces the wear on the machine, enabling the latter to be made much lighter, and consequently less expensive, as will be appreciated.

Havingthusdescribed my invention, what I claim, and desire to secure by Letters latent, is

1. In a mining-machine, the combination of the feed-screw, the threaded barrel or boxing pivotally supported in suitable bearings, and provided with a depending lug-or bracket, and a set-bolt turning through a threaded support, and adapted to engage said lug or bracket and adjust the boxing on the journals or bearings thereof and secure the said boxing in any desired position, substantially as set forth.

2. The cornbination,in a mining-machine, of the base-plate provided with bearing-jaws O, and bracket D, the feed-screw, the threaded barrel composed of section E, having lug F, provided with slot F and section E, having lug F pivoted to lug F, the said sections having upwardly-projected bars E, the collar E adapted to embrace bars E and the set-bolt D, turned through bracket D, and having a contracted portion, D on its rear end insert- ,ed through slot F and the nut D, all constructed and adapted to operate substantially as set forth.

3. The mining-machine, substantially as herein described and shown, composed of a said loops or keepers, and the clamping-screw K all as and for the purposes specified.

In testimony whereof I affix my signature in presence of two witnesses.

BENJAMIN B. DAVIS.

\Vitnesses:

J AMES LEWIS, T. F. MAKER. 

